Abstract
AbstractAlcoholysis of poly(ethylene terephthalate) (PET) waste to produce monomers, including methanolysis to yield dimethyl terephthalate (DMT) and glycolysis to generate bis-2-hydroxyethyl terephthalate (BHET), is a promising strategy in PET waste management. Here, we introduce an efficient PET-alcoholysis approach utilizing an oxygen-vacancy (Vo)-rich catalyst under air, achieving space time yield (STY) of 505.2 gDMT·gcat−1·h−1 and 957.1 gBHET·gcat−1·h−1, these results represent 51-fold and 28-fold performance enhancements compared to reactions conducted under N2. In situ spectroscopy, in combination with density functional theory calculations, elucidates the reaction pathways of PET depolymerization. The process involves O2-assisted activation of CH3OH to form CH3OH* and OOH* species at Vo-Zn2+–O–Fe3+ sites, highlighting the critical role of Vo-Zn2+–O–Fe3+ sites in ester bond activation and C–O bond cleavage. Moreover, a life cycle assessment demonstrates the viability of our approach in closed-loop recycling, achieving 56.0% energy savings and 44.5% reduction in greenhouse-gas emissions. Notably, utilizing PET textile scrap further leads to 58.4% reduction in initial total operating costs. This research offers a sustainable solution to the challenge of PET waste accumulation.
Publisher
Springer Science and Business Media LLC
Reference58 articles.
1. Global Polyester Market (Value, Volume)—Analysis By Product Type (Solid Fiber, HollowFiber), Grade (PET, PCDT), Application, By Region, By Country: Market Insights, COVID-19 Impact, Competition and Forecast (2020-2025). https://www.marketresearch.com/Azoth-Analytics-v4068/Global-Polyester-Value-Volume-Product-13297915/ (2020).
2. Payne, J. & Jones, M. D. The chemical recycling of polyesters for a circular plastics economy: challenges and emerging opportunities. ChemSusChem 14, 4041–4070 (2021).
3. Geyer, R. J., Jambeck, R. & Law, K. L. Production, use, and fate of all plastics ever made. Sci. Adv. 3, e1700782 (2017).
4. Rahimi, A. & García, J. M. Chemical recycling of waste plastics for new materials production. Nat. Rev. Chem. 1, 0046 (2017).
5. Tournier, V. et al. An engineered PET depolymerase to break down and recycle plastic bottles. Nature 580, 216–219 (2020).
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献